Fox 2000 has acquired film rights to Sally Green’s debut book Half Bad, a contemporary supernatural thriller, Deadline said.

The film will be produced by Karen Rosenfelt, whose recent films include Twilight Saga, Percy Jackson: Sea Of Monsters, and The Book Thief.

Half Bad starts a trilogy taking place in a world inhabited by covert witches; one faction is good and the other evil. They are divided by hatred and united by one thing only - fear of a boy descended from both sides.

The YA title will be published under the Penguin imprint in spring 2014. The book was a hot title at Bologna Children’s Book Fair, and since then, Zosia Knopp, Penguin Children’s Rights Director, concluded a six-figure U.S. rights deal at auction, along with Ken Wright, VP and Publisher of Viking, an imprint of Penguin Young Readers Group.